Ruff
Extremely fast Python linter and code formatter written in Rust for modern projects.
Used in agent projects
58
0.5% of 12,697 public repos built with AI coding agents
Rank in linting and formatting
#15 of 40
by use in those projects
Downloads
82.7M
PyPI, last 7 days, ruff
GitHub stars
50K
last push Oct 10, 2026
How Ruff is used
Ruff is a dependency in 58 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.5%), #15 of 40 in linting and formatting. The most used alternative there is ESLint. Projects that use it most often also use pytest (82.8%), Pydantic (72.4%), Uvicorn (62.1%).
Often used with Ruff
| pytest | 82.8% of Ruff projects · 31.8× more than average |
|---|---|
| Pydantic | 72.4% of Ruff projects · 14.2× more than average |
| Uvicorn | 62.1% of Ruff projects · 14.5× more than average |
| FastAPI | 53.4% of Ruff projects · 12.6× more than average |
| Requests | 53.4% of Ruff projects · 10.1× more than average |
| python-dotenv | 51.7% of Ruff projects · 7.9× more than average |
| NumPy | 48.3% of Ruff projects · 12.6× more than average |
| PyYAML | 43.1% of Ruff projects · 14.2× more than average |
By coding agent
| Claude Code | 1.0% of projects set up for it |
|---|---|
| GitHub Copilot | 1.0% of projects set up for it |
| Cursor | 0.9% of projects set up for it |
| Devin Desktop | 1.8% of projects set up for it |
| Gemini CLI | 1.1% of projects set up for it |
Share of public repos configured for each agent that list Ruff as a dependency.
Install
| Package | pip install ruff |
|---|---|
| Main stacks | Python (56), Next.js (2) |
| Example projects | kr8tiv-ai/Jarvis, siiway/NextBridge, sacahan/CasualMarket, MarcusJellinghaus/mcp-tools-py, piplabs/story-mcp-hub |
Alternatives to Ruff
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| ESLint npm Linter that finds and fixes JavaScript code patterns based on AST analysis. |
4,833 (38.1%) | 162M | 27.6K | MIT |
| Prettier npm Opinionated code formatter for JavaScript, TypeScript, and related languages. |
2,218 (17.5%) | 138M | 52.4K | MIT |
| Biome npm Fast web toolchain providing linting, formatting and code quality all in one. |
445 (3.5%) | 17.7M | 25.9K | MIT OR Apache-2.0 |
| oxlint npm Fast JavaScript linter written in Rust with zero-config defaults. |
206 (1.6%) | 25.7M | 23K | MIT |
| Knip npm Find and fix unused dependencies, exports and files in TypeScript/JavaScript projects. |
150 (1.2%) | 17.5M | 12.4K | ISC |
| stylelint npm Linter that finds and fixes CSS errors and enforces code style conventions. |
140 (1.1%) | 10.8M | 11.5K | MIT |
| oxfmt npm Fast JavaScript formatter from the Oxc compiler project. |
125 (1.0%) | 16.3M | 23K | MIT |
| ESLint Import Resolver TypeScript npm ESLint plugin resolver adding TypeScript support to import/export linting. |
119 (0.9%) | 48.8M | 825 | ISC |